Symptom Troubleshooting Index
For electrical malfunctions which are indicated by the self-diagnostic system, refer to self-diagnostic function (see
GENERAL TROUBLESHOOTING INFORMATION ).
DTC Troubleshooting Index
| Symptom |
Diagnostic procedure |
Also check for |
| Recirculation control doors do not change between Fresh and Recirculate |
RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING |
- Blown No. 20 (7.5 A) fuse in the under-dash fuse/relay box
- Cleanliness and tightness of all connectors
|
| Blower and heater controls do not work |
HEATER CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING |
- Blown No. 56 (40 A) fuse in the main under-hood fuse/relay box, and No. 20 (7.5 A) fuse in the under-dash fuse/relay box
- Poor ground at No. G201, G402
- Cleanliness and tightness of all connectors
|
| Insufficient heating |
- Check the coolant level (see COOLANT REPLACEMENT
)
- Check the radiator cap (see RADIATOR CAP TEST
)
- Check the coolant temperature
- Check the operation of the air mix control motor and door (see
AIR MIX CONTROL MOTOR TEST )
- Check the operation of the heater valve (see
DUST AND POLLEN FILTER REPLACEMENT )
- Check the blower motor for obstructions
- Check for air leaks around the ducts and vents
- Check the inlet heater hose temperature
- If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, and a damaged or leaking water pump.
- If it is HOT, check for restrictions in the heater core. Back flush the heater core using standard commercially available equipment, or replace the heater core.
|
Damaged cylinder head gasket |